linux-kernel - [PATCH 3/5] SPI: Add helper macro for spi

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Date:	Wed, 16 Nov 2011 10:13:37 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Greg Kroah-Hartman <gregkh@...e.de>,
	Jean Delvare <khali@...ux-fr.org>,
	Grant Likely <grant.likely@...retlab.ca>
CC:	Jonathan Cameron <jic23@...nel.org>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-i2c@...r.kernel.org>,
	<spi-devel-general@...ts.sourceforge.net>,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH 3/5] SPI: Add helper macro for spi_driver boilerplate

This patch introduces the module_spi_driver macro which is a convenience macro
for SPI driver modules similar to module_platform_driver. It is intended to be
used by drivers which init/exit section does nothing but register/unregister
the SPI driver. By using this macro it is possible to eliminate a few lines of
boilerplate code per SPI driver.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
---
 include/linux/spi/spi.h |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index bb4f5fb..176fce9 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -200,6 +200,17 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
 		driver_unregister(&sdrv->driver);
 }
 
+/**
+ * module_spi_driver() - Helper macro for registering a SPI driver
+ * @__spi_driver: spi_driver struct
+ *
+ * Helper macro for SPI drivers which do not do anything special in module
+ * init/exit. This eliminates a lot of boilerplate. Each module may only
+ * use this macro once, and calling it replaces module_init() and module_exit()
+ */
+#define module_spi_driver(__spi_driver) \
+	module_driver(__spi_driver, spi_register_driver, \
+			spi_unregister_driver)
 
 /**
  * struct spi_master - interface to SPI master controller
-- 
1.7.7.1


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